文档介绍：Abstract Due totherapiddevelopment ofsocialeconomy,population growth toofast,the ecological system has suffered severe damage,environmental problems have increasingly prominent and with the living area ofthe city residents,particularly serious ecological haze weather,the scarcity ofwater resources,theurban heatislandeffect,areaffecting people’S normal life,people living insuchanenvironment urgent hope tobeabletofmd effective ways toalleviate ortoimprove greening isinthelimited urban space increase rateisthemost effective way,is conducive to protect theecological essence,regulating climate,air,the shieldcover,to reduce the greenhouse,noise,and theurban heatislandeffect,huge environmental greening as asmall branch of theecologicalenvironment system,it isthesame with otherecological environment system hasenormous ecological throughout thepast andthepresent research status athome andabroad,most is tovalue method to acting the benefit ofroof articleisbased on the basis of the willingness topay method,to evaluate salween areathe ecological value ofroof garden. Based on the salween districtofchengdu as thestudyarea,through summarizing the domestic andforeign experts ofroof greening and ecological value of the outstanding research results,thewillingness topay(WTP method(CVM)on the salween area tostudy theecological value ofall,discussed the basic situation ofroofgreening,and sums up theecological benefit ofroofgarden; bining theoretical basis,to define theecological value ofroofgarden; Furthermorethrough dataanalysis and selection oftheimpact factor,build themodel, calculating theecological valueand itsinfluencing factors;Finally,the resultsput forward thecorresponding countermeasures paper studies the main conclusion iS asfollows: (1)The research progress ofCVM method afterdecades of,although has certain limitation,but hisow